<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>面向对象</title>
</head>
<script>
 function Foo() {
    this.getName = function() {
        console.log(1);
    };
    return this;
}

Foo.getName = function() {
    console.log(2);
};

Foo.prototype.getName = function() {
    console.log(3);
};

var getName = function() {
    console.log(4);
};

function getName() {
    console.log(5);
}

console.log(Foo.getName());
console.log(getName());
console.log(Foo().getName()); 
console.log(new Foo.getName()); 
console.log(new Foo().getName());
    </script>
    </head>
    <body>
    </body>
    </html>